CVE-2023-53101
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: zero i_disksize when initializing the bootloader inode If the boot loader inode has never been used before, the EXT4_IOC_SWAP_BOOT inode will initialize it, including setting the i_size to 0. However, if the "never before used" boot loader has a non-zero i_size, then i_disksize will be non-zero, and the inconsistency between i_size and i_disksize can trigger a kernel warning: WARNING: CPU: 0 PID: 2580 at fs/ext4/file.c:319 CPU: 0 PID: 2580 Comm: bb Not tainted 6.3.0-rc1-00004-g703695902cfa RIP: 0010:ext4_file_write_iter+0xbc7/0xd10 Call Trace: vfs_write+0x3b1/0x5c0 ksys_write+0x77/0x160 __x64_sys_write+0x22/0x30 do_syscall_64+0x39/0x80 Reproducer: 1. create corrupted image and mount it: mke2fs -t ext4 /tmp/foo.img 200 debugfs -wR "sif <5> size 25700" /tmp/foo.img mount -t ext4 /tmp/foo.img /mnt cd /mnt echo 123 > file 2. Run the reproducer program: posix_memalign(&buf, 1024, 1024) fd = open("file", O_RDWR | O_DIRECT); ioctl(fd, EXT4_IOC_SWAP_BOOT); write(fd, buf, 1024); Fix this by setting i_disksize as well as i_size to zero when initiaizing the boot loader inode.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-05-02 16:15:29.023000
Last modified
2026-11-05 21:17:13.013000
View original CVE JSON
{
"id": "CVE-2023-53101",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-05-02T16:15:29.023",
"lastModified": "2026-11-05T21:17:13.013",
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: zero i_disksize when initializing the bootloader inode\n\nIf the boot loader inode has never been used before, the\nEXT4_IOC_SWAP_BOOT inode will initialize it, including setting the\ni_size to 0. However, if the \"never before used\" boot loader has a\nnon-zero i_size, then i_disksize will be non-zero, and the\ninconsistency between i_size and i_disksize can trigger a kernel\nwarning:\n\n WARNING: CPU: 0 PID: 2580 at fs/ext4/file.c:319\n CPU: 0 PID: 2580 Comm: bb Not tainted 6.3.0-rc1-00004-g703695902cfa\n RIP: 0010:ext4_file_write_iter+0xbc7/0xd10\n Call Trace:\n vfs_write+0x3b1/0x5c0\n ksys_write+0x77/0x160\n __x64_sys_write+0x22/0x30\n do_syscall_64+0x39/0x80\n\nReproducer:\n 1. create corrupted image and mount it:\n mke2fs -t ext4 /tmp/foo.img 200\n debugfs -wR \"sif <5> size 25700\" /tmp/foo.img\n mount -t ext4 /tmp/foo.img /mnt\n cd /mnt\n echo 123 > file\n 2. Run the reproducer program:\n posix_memalign(&buf, 1024, 1024)\n fd = open(\"file\", O_RDWR | O_DIRECT);\n ioctl(fd, EXT4_IOC_SWAP_BOOT);\n write(fd, buf, 1024);\n\nFix this by setting i_disksize as well as i_size to zero when\ninitiaizing the boot loader inode."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: i_disksize cero al inicializar el inodo del cargador de arranque. Si el inodo del cargador de arranque nunca se ha usado antes, el inodo EXT4_IOC_SWAP_BOOT lo inicializará, incluyendo el establecimiento de i_size a 0. Sin embargo, si el cargador de arranque \"nunca usado antes\" tiene un i_size distinto de cero, entonces i_disksize será distinto de cero, y la inconsistencia entre i_size e i_disksize puede activar una advertencia del kernel: ADVERTENCIA: CPU: 0 PID: 2580 en fs/ext4/file.c:319 CPU: 0 PID: 2580 Comm: bb No contaminado 6.3.0-rc1-00004-g703695902cfa RIP: 0010:ext4_file_write_iter+0xbc7/0xd10 Rastreo de llamadas: vfs_write+0x3b1/0x5c0 ksys_write+0x77/0x160 __x64_sys_write+0x22/0x30 do_syscall_64+0x39/0x80 Reproductor: 1. crear una imagen dañada y montarla: mke2fs -t ext4 /tmp/foo.img 200 debugfs -wR \"sif <5> size 25700\" /tmp/foo.img mount -t ext4 /tmp/foo.img /mnt cd /mnt echo 123 > file 2. Ejecutar el programa reproductor: posix_memalign(&buf, 1024, 1024) fd = open(\"file\", O_RDWR | Solucione esto configurando i_disksize e i_size en cero al iniciar el inodo del cargador de arranque."
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